當前城市道路中越來越多的井蓋都呈現(xiàn)瞭下沉的狀況，井蓋下沉是什麼狀況，我們?nèi)绾翁幚砭w下沉這個問題呢？
一、裝置施工問題：
1、井蓋及井壁構造設計尺度低，其構造層無加固增強設計等。
2、在途機動車行道範圍規(guī)劃佈設管線工程不閤理。
3、城市交通中大批重型超載車輛，選用井蓋的產(chǎn)品荷載纔能缺乏形成破損。
4、井壁接受力小，超齣所能接受井蓋自重和車輛荷載，形成沉降。
5、
井蓋底座加固施工不標準，招緻井蓋與路麵不平，框架決裂、以至井蓋壽命降低破損。
6、井蓋裝置不標準，施工人員不按規(guī)則請求裝置。
由于構築物沉降速度隨時間而減緩直至中止沉降，因而在道路投入運用較長時間後井週瀝青毀壞并不是窨井下沉形成的，應爲井蓋在長期荷載作用下，不時發(fā)作彈性變形，使井週瀝青在井蓋邊框重復作用下變形至極限形成疲倦毀壞，斷裂破損。鼕季呈現(xiàn)狀況較多，常在20CM左右範圍內(nèi)呈現(xiàn)裂痕，且井盞有明顯下沉。
Today's urban road with subsidence appeared more and more covers, manhole covers sinking is what circumstance, how can we solve the manhole cover down this problem?
Installation problem:
1, manhole covers, and wall structure design scale is low, the structure layer without reinforcement to strengthen design, etc.
2, in road motorway pipeline project scope planning layout is not reasonable.
3, large quantities of heavy overloading vehicles in urban traffic, lacking the ability to choose the product load manhole covers, causing damage.
4, small tolerance of shaft wall, than can withstand the weight of manhole covers and vehicle load, settlement.
5, covers the base reinforcement construction, manhole covers and the road is rough, rupture of the framework and even covers life reduce breakage.
6, covers installation, construction personnel is not required to install according to the rules.
Due to the structure of sedimentation velocity with time and slow and eventually stop settlement, therefore in the asphalt road well put into use after a long time weeks damage is not caused by CMC sinking, should be well cover under long-term load, continuous elastic deformation occurs, keep well asphalt in the manhole cover frame under the action of repeated deformation to extreme fatigue damage, fracture damage. The appearance is more, the winter often cracks within 20 cm, and Wells have obvious subsidence.